I�C was designed to communicate over short distances between printed circuit boards and is a simple, 8-bit serial data bus. For the time being, it is not only PCB-mountable pressure sensors that utilize the I�C signal for data transfer, but also pressure sensors remote from customer electronics.
Remote sensors will often have the benefit of being less sensitive to contaminated or aggressive media and being able to measure directly at the procedure. Regarding sensors mounted on the circuit board, the sensor element is, oftentimes, exposed directly to the medium. With remote sensors, steel or ceramic generally serve because the wetted surface.
I�C circuit
The I�C bus, alongside both supply lines, requires only two further lines:
SCL (serial clock line)
SDA (serial data line)
Additional possibilities through I�C
The I�C bus is really a well-known standard in electronics, offering additional possibilities for communication with a pressure sensor than with an analogue signal:
In the data protocol, as well as the pressure value, a temperature value and diagnostic information (for example an integrity test of the info transfer) could be transmitted with a status byte.
Several pressure sensors could be linked to a bus line as ?slaves? to the client electronics that functions as a ?master?.
On the customer side, as opposed to the usage of pressure sensors with analogue signals, the analogue-to-digital conversion of the pressure value for further signal processing is unnecessary since the pressure value has already been within digital form. This plays a part in faster and easier signal processing.
The electronics for communication can be built with standard components readily available on the market.
Often, I�C signal pressure sensors may also be optimised to consume less energy, making them perfect for battery-powered applications. In the WIKA portfolio, for example, this applies to the MPR-1 pressure sensor module.
Boundary conditions by using I�C
Since I�C isn’t a fieldbus, long wire lengths are not recommended. The maximum wire length depends, in detail, on the operating environment and the corresponding disturbing influences. I�C communication is most beneficial used in projects where in fact the pressure sensor or the pressure sensor module is integrated into the customer product and therefore protected against external influences. It will also be noted that with any digitally processed signal, the response time due to discrete-time sampling will undoubtedly be somewhat slower than for an analogue, continuous signal.
Note
Your contact person will be happy to help you with any further questions on digital interfaces.
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